control parameters for boundary-layer instabilities in unsteady shock interactions对边界层控制参数不稳定不稳定冲击的相互作用.pdfVIP

Entropy 2012, 14, 131-160; doi:10.3390/ OPEN ACCESS entropy ISSN 1099-4300 /journal/entropy Article Control Parameters for Boundary-Layer Instabilities in Unsteady Shock Interactions LaVar King Isaacson Professor Emeritus of Mechanical Engineering, University of Utah, 2067 Browning Avenue, Salt Lake City, UT 84108, USA; E-Mail: lkisaacson1@ Received: 7 November 2011; in revised form: 18 January 2012 / Accepted: 18 January 2012 / Published: 31 January 2012 Abstract: This article presents the computation of a set of control parameters for the deterministic prediction of laminar boundary-layer instabilities induced by an imposed unsteady shock interaction. The objective of the study is exploratory in nature by computing a supersonic flight environment for flow over a blunt body and the deterministic prediction of the spectral entropy rates for the boundary layer subjected to an unsteady pressure disturbance. The deterministic values for the spectral entropy rate within the instabilities are determined for each control parameter. Computational results imply that the instabilities are of a span-wise vortex form, that the maximum vertical velocity wave vector components are produced in the region nearest the wall and that extended transient coherent structures are produced in the boundary layer at a vertical location